org.apache.openjpa.jdbc.meta.strats.EmbeddedClassStrategy Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.openjpa.jdbc.meta.strats;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.ClassMappingInfo;
import org.apache.openjpa.jdbc.meta.JavaSQLTypes;
import org.apache.openjpa.jdbc.meta.ValueMapping;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.MetaDataException;
/**
* Class mapping for embedded objects.
*
* @author Abe White
* @nojavadoc
*/
public class EmbeddedClassStrategy
extends AbstractClassStrategy {
private static final Localizer _loc = Localizer.forPackage
(EmbeddedClassStrategy.class);
public void map(boolean adapt) {
ValueMapping vm = cls.getEmbeddingMapping();
if (vm == null || vm.getType() != cls.getDescribedType())
throw new MetaDataException(_loc.get("not-embed", cls));
ClassMappingInfo info = cls.getMappingInfo();
info.assertNoSchemaComponents(cls, true);
ClassMapping owner = null;
if (vm.getValueMappedByMapping() != null)
owner = vm.getValueMappedByMapping().getDefiningMapping();
else
owner = vm.getFieldMapping().getDefiningMapping();
cls.setIdentityType(owner.getIdentityType());
cls.setObjectIdType(owner.getObjectIdType(),
owner.isObjectIdTypeShared());
cls.setTable(vm.getFieldMapping().getTable());
cls.setPrimaryKeyColumns(owner.getPrimaryKeyColumns());
cls.setColumnIO(owner.getColumnIO());
}
/**
* Return the proper synthetic null indicator value for the given instance.
*/
public Object getNullIndicatorValue(OpenJPAStateManager sm) {
Column[] cols = cls.getEmbeddingMapping().getColumns();
if (cols.length != 1)
return null;
if (sm == null && !cols[0].isNotNull())
return null;
if (sm == null)
return JavaSQLTypes.getEmptyValue(cols[0].getJavaType());
return JavaSQLTypes.getNonEmptyValue(cols[0].getJavaType());
}
/**
* Return whether the given null indicator value means the object is null.
*/
public boolean indicatesNull(Object val) {
Column[] cols = cls.getEmbeddingMapping().getColumns();
if (cols.length != 1)
return false;
if (val == null)
return true;
if (cols[0].isNotNull()
&& val.equals(JavaSQLTypes.getEmptyValue(cols[0].getJavaType())))
return true;
if (cols[0].getDefaultString() != null
&& val.toString().equals(cols[0].getDefaultString()))
return true;
return false;
}
public boolean isPrimaryKeyObjectId(boolean hasAll) {
return cls.getEmbeddingMapping().getFieldMapping().
getDefiningMapping().isPrimaryKeyObjectId(hasAll);
}
}